Adjusting clocks and watches to changes in temperature.



No. 850,887. I v PATENTEE APR.16, 1'907.

f S. KAHAN.

ADJUSTING CLOCKS AND WATCHES T0 CHANGES IN TEMPERATURE.

APPLICATION FILED JULY 31, 1906.

W/TNESSES INVENTO? A Wwf@ SAMUEL KAHAN, OF NEW YURK, N. Y.

ADJUSTING CLOCKS AND WATCHES TO CHANGES lN TEMPERATURE.

Specification of lLetters Patent.

Patented April 16, 1907.

. Application filed July 31,1906. Serial No. 328,536.

To lf/Z who/'1t it 77mg/ concern:

Beit known that I, SAMUEL KAHAN, a subject ot the King of Great Britain, and a resident ot' the city of New York, borough ot Manhattan, in the county and State ot New York', have invented a new and Improved Compensating Device, oit which the Yfollowing is a full, clear, and exact description.

This invention relates to certain improvements in horology, and more particularly to means for compensating for changes in temperature.

The object et the invention is to provide means 'for varying the length ot he suspension-feather of a pendulum, or the hair-spring oi a watch, or the oscillating member ot any other' form of timepiece, so to otlset the variation in length caused by changes in temperature.

My invention is particularly applicable to clocks, and when employed in connection therewith it avoids the necessity lor delicately-constructed. pendulums and balances composed of various materials.

Reference is to be had to the accompanying drawings, forming a part ot this specilication, in which similar characters of reference indicate corresponding parts in all the ligures, in which- Figure 1 is a vertical section olI one embodiment ot my invention, said section being taken on the line l l. ot Fig. 2. Fig. 52 a Vtront elevation oi the device illustratedin Eig. l, and Fig. 3 is a transverse section taken on the line 3 3 ot Fig. 1.

In the drawinOs I have .illustrated a lportion of a clock embodying my invention and comprising any suitable form ol" supporte-as,

for instance, a trame 5, provided with arms 6, extending upwardly therefrom and connected by a cross member 7, from. which the pendulum is suspended. As shown, the pendulum comprises a pendulum-bar 8, connected to a feather 9, as is connnon in clocks ot this type. The upper end oi' the feather is rigidly held within a supporting-block l0, which latter is provided with a short opening 1]., serving to support the pendulum. In the rear of the pendulum is supported the pallet-arbor 12, rigidly connected by a bar 13 to the crotch surrounding the pendulumbar 8. As the pendulum swings from side to side the movement of the crotch oscillates the pallet-arbor and controls the escapement in the well-known manner.

The arms 6 are provided with projections Lil, extending rearwardly .from a point adj acent each side ol the pendulum, and at their cuter ends they support a bolt 15, directly in the rear ol the leather 9. Supported upon this bolt is a thermostatic coil 16, composed ci a plurality ol layers of di'l'lerent materialsvas, lcr instance, brass and steel-and designed te expand and contract with variations in temperature. The coil 16 is so constructed that it uncoils or expands upon an increase in temperature, and this expansion produces a lateral movement lot' the tree end 17 et the coil equivalent to the variation in the length ol the pendulum caused by the same change in temperature. The end 17 ol the eeil is oll a width substantially equal to the distance between the arms 6 6 and lies directly between these arms and in tree sliding engagement with both ol them. The endr intermediate the arms 6 6 is provided with a slot 1S olE a width but slightly greater than the thickness oi the leather and adapted to normally receive said feather. The end i7 may lreely move up and down and prevents any lateral movement ol the feather. The 'weight ol' the pendulum is supported entirely by the pin 11, and no weight whatever is sustained by the end 17, which latter 'merely determines the point of oscillation olI the pendulum. As the pendulum expands with increases in temperature the coil also expands and the end 17 lowers, so that the working length ol the pendulum is identically the same at all times.

Thev same principle may be applied to watches; but in this case the end. 17 ol the thermostatic coil would normally inclosc the l'iair-spring adjacent its outer end and the variations in the length ol said hair-spring thus readily taken up by varying its etl'ective or working length. In watches the variation in the working length would also compensate lior the variation in the operation of the balance-wheel.

llaving thus described my invention, I

claim as new and desire to secure by Letters Patentn 1. A device el the class described, comprising an oscillating member, means lor rigidly supporting one end thereof, a thermostatic coil in engagement with said oscillating member adjacent its point ol support and adapted to maintain constant its operating length to compensate lor variations in temperature, and means adjacent said coil ICO IIO

for preventing movement thereof other than l that caused by changes in temperature. i

2. A device of the class described. eomg prising a pendulum, means for supporting l the same, a thermostatic coil having one end i thereof rigidly supported and the opposite end thereof in engagement with said pendulum adjacent its point of support and adaptl ed to vary its point of oscillation, and means in engagement with said coil adjacent the last-mentioned end thereof and adapted to prevent movement thereof in the plane of movement of the pendulum.

3. A device of the class described7 comprising a pendulum having a supportingl feather, means for rigidly supporting one l end of said feather, a thermostatic coil having one end rigidly supported and the opposite free end in engagement with the feather i of said pendulum below the point ol support, and plates in engagement with the opposite sides of the free end of the coil and adapted to prevent longitudinal movement thereof.

4t. A device of the class described, comprising a pendulum having a supportingfeather7 means for rigidly supporting one sedes? end of the feather, a thermostatic coil having one end rigidly supported and the other end in engagement with the feather of the pendulum below said point of support and movable in a plane at right angles to the plane of movement of the pendulum, and means for preventing lateral movement of the lastmentioned end of said Coil.

5. A device of the class described, comprising plurality of substantially parallel i supporting members, a pendulum having a feather supported adjacent the upper eiids of said members and extending.therebetiveen, and a thermostatic coil having one end rigidly supported and the free end of a -width substantially equal to the distance betvv'een said supportiiig members and havingI a slot through which the feather of said pendulum extends, wliereby the point of oscillation of the pendulum may be varied to compensate for variations in the length of said pendulum.

SAMUEL KAI IAN. Ni tnesses:

Mon'rmnn CULLINAN, En w1 N ,l lo uwrrz. 

